There's different responses for various stress put on me..
1. I widen my eyes a little and squeeze my lips together out of anger
2. I breathe in and out angrily (but quietly xD)
3. I start yelling *cough in my mind*
4. I listen to music

Sometimes it's crying and letting it all out and yelling and sighing. I've broken things, crumpled things, thrown things away, and burned things. Usually I try to do more healthy choices, though. But it depends on why I'm stressed, the intensity, the situation/environment, etc.